Repair Instructions; Engine Control Module (Ecm) Replacement . 1A-349 - Isuzu N 2008 Series Workshop Manual

Engine Control
Replacement
Description
The following A - G steps provide an overview
procedure to replace and reprogram an ECM. Each A -
G steps is explained further in this section.
A. Upload the fuel injector ID codes from the old ECM.
B. Reset the immobilizer security information in the old
ECM. (If so equipped)
C. Replace the old ECM with the new ECM.
D. Program the immobilizer security information into the
new ECM. (If so equipped)
E. Program the latest software and calibrations into the
new ECM using the Service Programming System
(SPS).
F. Program the uploaded fuel injector ID codes and
program the vehicle identification number (VIN) into
the ECM using a scan tool programming function.
G. Perform the fuel supply pump relearn procedure by
allowing the engine to idle in Park or Neutral until
normal operating temperature is achieved.
A. Uploading Fuel Injector ID Code
The current fuel injector ID code data can be uploaded
with a scan tool. If the old ECM cannot be
communicated with a scan tool, go to Retrieving the
Fuel Injector ID Code Data with a Non-communicating
ECM.
1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Select Diagnostics
identification > appropriate engine model >
Programming > Store ECU setting (Euro 4
specification) or Injector ID Code (except Euro 4
specification) < Upload ID Code (except Euro 4
specification).
4. After compete the uploading, turn OFF the scan
tool.
5. Turn OFF the ignition.
Retrieving the Fuel Injector ID Code Data with a
Non-communicating ECM
If a scan tool does not communicate, the fuel injector ID
codes must be recorded from the factory affixed label
on the cylinder head cover or each fuel injector harness
connector housing.
Recording from the label on cylinder head cover
Notice: Only perform this procedure if the fuel injectors
are not being replaced in the past.

Repair Instructions

Module (ECM)
> appropriate vehicle
Engine Control System (4JJ1)
1. Record all numbers of each cylinder on the label.
SAMPLE
1
2
5F DE 07
5F F9 0D
3
5F F1 07
5F E2 00
4
Legend
1. Cylinder #1 fuel injector ID code
2. Cylinder #2 fuel injector ID code
3. Cylinder #3 fuel injector ID code
4. Cylinder #4 fuel injector ID code
5. Injector ID code label
Recording from each fuel injector
1. Disconnect each fuel injector harness connector.
2. Record all numbers of each cylinder on the
harness connector housing. The correct order for
the fuel injector ID codes of the following
illustration is as follows:
5F 05 00 FB 00 F7 08 F5 19 FF 04 49
SAMPLE
1
Legend
1. Fuel injector ID code
2. Fuel injector
4JJ1
F1 0F 11 0E 07 EF 07 06 8E
F1 0C 0C 03 05 03 19 09 4F
00 0C 05 01 FA 10 10 04 BE
DD 04 06 0A FF E8 09 00 76
5
LNW81ASH001001
5F 05 00
FB 00 F7
08 F5 19
FF 04 49
2
RTW76ESH002601
1A-349